Invalid argument. The coffee is chemically active so the flavor CHANGES after a short amount of time. If you have not had coffee just roasted and tried it over a period of days you would not know the difference. The easiest way to describe is that it gets mellower and less sweet. As to weather it really makes a difference that is subjective. If trying to brew the PERFECT cup of coffee however then it definitely makes a difference. Coffee being discovered in Ethiopia tends to give enormous credibility to the practices and methodology of Ethiopians regarding coffee. The initial period of 12-24 hours for degassing, standard practice among europeans is ignored since all the coffee is used right away. This mostly applies to bubbles that foam up during brewing but coffee that has not degassed has a wilder flavor also. In practice at home I usually use it within 2-4 days but after 5-7 days it is not the same. as before of directly after the 12-24 hour period; first getting mellower and then towards bitter.